Backport of s3: fix S3 Object Lock header issue for lock file writes into v1.10

CHANGELOG.md

@@ -5,6 +5,7 @@ BUG FIXES:
 - config: `templatefile` would panic if given and entirely unknown map of variables [GH-36118]
 - config: `templatefile` would panic if the variables map contains marked values [GH-36127]
 - config: Remove constraint that an expanded resource block must only be used in conjunction with imports using `for_each` [GH-36119]
+- backend/s3: Lock files could not be written to buckets with object locking enabled [GH-36120]
 
 ## 1.10.0 (November 27, 2024)
 

internal/backend/remote-state/s3/backend_test.go

@@ -2038,6 +2038,76 @@ func TestBackendLockedWithFile(t *testing.T) {
 	backend.TestBackendStateForceUnlock(t, b1, b2)
 }
 
+func TestBackendLockedWithFile_ObjectLock_Compliance(t *testing.T) {
+	testACC(t)
+	objectLockPreCheck(t)
+
+	ctx := context.TODO()
+
+	bucketName := fmt.Sprintf("terraform-remote-s3-test-%x", time.Now().Unix())
+	keyName := "test/state"
+
+	b1 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":       bucketName,
+		"key":          keyName,
+		"encrypt":      true,
+		"use_lockfile": true,
+		"region":       "us-west-2",
+	})).(*Backend)
+
+	b2 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":       bucketName,
+		"key":          keyName,
+		"encrypt":      true,
+		"use_lockfile": true,
+		"region":       "us-west-2",
+	})).(*Backend)
+
+	createS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region,
+		s3BucketWithVersioning,
+		s3BucketWithObjectLock(s3types.ObjectLockRetentionModeCompliance),
+	)
+	defer deleteS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region)
+
+	backend.TestBackendStateLocks(t, b1, b2)
+	backend.TestBackendStateForceUnlock(t, b1, b2)
+}
+
+func TestBackendLockedWithFile_ObjectLock_Governance(t *testing.T) {
+	testACC(t)
+	objectLockPreCheck(t)
+
+	ctx := context.TODO()
+
+	bucketName := fmt.Sprintf("terraform-remote-s3-test-%x", time.Now().Unix())
+	keyName := "test/state"
+
+	b1 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":       bucketName,
+		"key":          keyName,
+		"encrypt":      true,
+		"use_lockfile": true,
+		"region":       "us-west-2",
+	})).(*Backend)
+
+	b2 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":       bucketName,
+		"key":          keyName,
+		"encrypt":      true,
+		"use_lockfile": true,
+		"region":       "us-west-2",
+	})).(*Backend)
+
+	createS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region,
+		s3BucketWithVersioning,
+		s3BucketWithObjectLock(s3types.ObjectLockRetentionModeGovernance),
+	)
+	defer deleteS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region)
+
+	backend.TestBackendStateLocks(t, b1, b2)
+	backend.TestBackendStateForceUnlock(t, b1, b2)
+}
+
 func TestBackendLockedWithFileAndDynamoDB(t *testing.T) {
 	testACC(t)
 
@@ -2158,6 +2228,116 @@ func TestBackend_LockFileCleanupOnDynamoDBLock(t *testing.T) {
 	}
 }
 
+func TestBackend_LockFileCleanupOnDynamoDBLock_ObjectLock_Compliance(t *testing.T) {
+	testACC(t)
+	objectLockPreCheck(t)
+
+	ctx := context.TODO()
+
+	bucketName := fmt.Sprintf("terraform-remote-s3-test-%x", time.Now().Unix())
+	keyName := "test/state"
+
+	b1 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":         bucketName,
+		"key":            keyName,
+		"encrypt":        true,
+		"use_lockfile":   false, // Only use DynamoDB
+		"dynamodb_table": bucketName,
+		"region":         "us-west-2",
+	})).(*Backend)
+
+	b2 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":         bucketName,
+		"key":            keyName,
+		"encrypt":        true,
+		"use_lockfile":   true, // Use both DynamoDB and lockfile
+		"dynamodb_table": bucketName,
+		"region":         "us-west-2",
+	})).(*Backend)
+
+	createS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region,
+		s3BucketWithVersioning,
+		s3BucketWithObjectLock(s3types.ObjectLockRetentionModeCompliance),
+	)
+	defer deleteS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region)
+	createDynamoDBTable(ctx, t, b1.dynClient, bucketName)
+	defer deleteDynamoDBTable(ctx, t, b1.dynClient, bucketName)
+
+	backend.TestBackendStateLocks(t, b1, b2)
+
+	// Attempt to retrieve the lock file from S3.
+	_, err := b1.s3Client.GetObject(ctx, &s3.GetObjectInput{
+		Bucket: aws.String(b1.bucketName),
+		Key:    aws.String(b1.keyName + ".tflock"),
+	})
+	// We expect an error here, indicating that the lock file does not exist.
+	// The absence of the lock file is expected, as it should have been
+	// cleaned up following a failed lock acquisition due to `b1` already
+	// acquiring a DynamoDB lock.
+	if err != nil {
+		if !IsA[*s3types.NoSuchKey](err) {
+			t.Fatalf("unexpected error: %s", err)
+		}
+	} else {
+		t.Fatalf("expected error, got none")
+	}
+}
+
+func TestBackend_LockFileCleanupOnDynamoDBLock_ObjectLock_Governance(t *testing.T) {
+	testACC(t)
+	objectLockPreCheck(t)
+
+	ctx := context.TODO()
+
+	bucketName := fmt.Sprintf("terraform-remote-s3-test-%x", time.Now().Unix())
+	keyName := "test/state"
+
+	b1 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":         bucketName,
+		"key":            keyName,
+		"encrypt":        true,
+		"use_lockfile":   false, // Only use DynamoDB
+		"dynamodb_table": bucketName,
+		"region":         "us-west-2",
+	})).(*Backend)
+
+	b2 := backend.TestBackendConfig(t, New(), backend.TestWrapConfig(map[string]interface{}{
+		"bucket":         bucketName,
+		"key":            keyName,
+		"encrypt":        true,
+		"use_lockfile":   true, // Use both DynamoDB and lockfile
+		"dynamodb_table": bucketName,
+		"region":         "us-west-2",
+	})).(*Backend)
+
+	createS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region,
+		s3BucketWithVersioning,
+		s3BucketWithObjectLock(s3types.ObjectLockRetentionModeGovernance),
+	)
+	defer deleteS3Bucket(ctx, t, b1.s3Client, bucketName, b1.awsConfig.Region)
+	createDynamoDBTable(ctx, t, b1.dynClient, bucketName)
+	defer deleteDynamoDBTable(ctx, t, b1.dynClient, bucketName)
+
+	backend.TestBackendStateLocks(t, b1, b2)
+
+	// Attempt to retrieve the lock file from S3.
+	_, err := b1.s3Client.GetObject(ctx, &s3.GetObjectInput{
+		Bucket: aws.String(b1.bucketName),
+		Key:    aws.String(b1.keyName + ".tflock"),
+	})
+	// We expect an error here, indicating that the lock file does not exist.
+	// The absence of the lock file is expected, as it should have been
+	// cleaned up following a failed lock acquisition due to `b1` already
+	// acquiring a DynamoDB lock.
+	if err != nil {
+		if !IsA[*s3types.NoSuchKey](err) {
+			t.Fatalf("unexpected error: %s", err)
+		}
+	} else {
+		t.Fatalf("expected error, got none")
+	}
+}
+
 func TestBackend_LockDeletedOutOfBand(t *testing.T) {
 	testACC(t)
 

internal/backend/remote-state/s3/client.go

@@ -358,6 +358,9 @@ func (c *RemoteClient) lockWithFile(ctx context.Context, info *statemgr.LockInfo
 		Key:         aws.String(c.lockFilePath),
 		IfNoneMatch: aws.String("*"),
 	}
+	if !c.skipS3Checksum {
+		input.ChecksumAlgorithm = s3types.ChecksumAlgorithmSha256
+	}
 
 	if c.serverSideEncryption {
 		if c.kmsKeyID != "" {
@@ -378,7 +381,8 @@ func (c *RemoteClient) lockWithFile(ctx context.Context, info *statemgr.LockInfo
 
 	log.Debug("Uploading lock file")
 
-	_, err = c.s3Client.PutObject(ctx, input)
+	uploader := manager.NewUploader(c.s3Client)
+	_, err = uploader.Upload(ctx, input)
 	if err != nil {
 		// Attempt to retrieve lock info from the file, and merge errors if it fails.
 		lockInfo, infoErr := c.getLockInfoWithFile(ctx)